The preparation of enantiomerically pure ligands which contain both an oxazoline group and an additional sulfur or phosphorus donor atom are described. Methylthiomethyl, o-thioanisyl and thienyl oxazolines have been prepared in one step, and o-diphenylphosphinophenyl oxazolines have been prepared in two steps in good yields from commercially available starting materials.
Allen, J. V., Dawson, G. J., Frost, C. G., Williams, J. M. J., & Coote, S. J. (1994). Preparation of novel sulfur and phosphorus containing oxazolines as ligands for asymmetric catalysis. Tetrahedron, 50(3), 799-808. https://doi.org/10.1016/S0040-4020(01)80795-X